Why does this issue a badmatch error? I can’t figure out why this would fail:
<<IpAddr, ":*:*">> = <<"2a01:e34:ee8b:c080:a542:ffaf:*:*">>.
Why does this issue a badmatch error? I can’t figure out why this would
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Why does this issue a badmatch error? I can’t figure out why this would fail:
<<IpAddr, ":*:*">> = <<"2a01:e34:ee8b:c080:a542:ffaf:*:*">>.
Pattern matching of a binary proceeds left-to-right so it will match
IpAddrfirst before it tries the following segment. There is no back-tracking until there is a match. A default typed variable likeIpAddrmatches one byte. See Bit Syntax Expressions and Bit Syntax for a proper description and more examples.As alternative to using pattern matching here you might consider using the
binarymodule. There are two functions which could be useful to you:binary:match/2/3andbinary:split/2/3. These search which may better fit your problem.As a last alternative you could try using regular expressions and the
remodule.